Yes; it supports Intel Core i3, i5, and i7 and any other LGA1155 socket CPUs. And no, it does not support 3-way SLI. However, it does support 2-way and 4-way SLI.
Its bigger brother, the ASRock Z77 Extreme6 does support 1- to 4-way SLI. (Bad terminology, I know)
It supports the i5-3570K (which I will be upgrading to soon) and only supports 2-way SLI because it only has 2 PCIe slots.
Edit: If you want 3-way SLI, get the Extreme 3 (which is better in almost every respect, just has 2 less SATA ports, which is no big for me).
Yes; it supports Intel Core i3, i5, and i7 and any other LGA1155 socket CPUs. And no, it does not support 3-way SLI. However, it does support 2-way and 4-way SLI.
Its bigger brother, the ASRock Z77 Extreme6 does support 1- to 4-way SLI. (Bad terminology, I know)
Yes; it supports Intel Core i3, i5, and i7 and any other LGA1155 socket CPUs. And no, it does not support 3-way SLI. However, it does support 2-way and 4-way SLI.
4 way, hmm?
I thought there was only 2 way SLI config. I see 4 slots, but only 2 look like PCI :L
*edit*
Ah, my mistake. I'm so stuck behind in the past, forgot newer cards support PCI 3.0.
There is one PCIe x1, two PCI, and two PCIe 3.0 slots. With the two PCIe 3.0 slots, you can do 2-way SLI or 4-way SLI. For example, the NVIDIA GTX 690 is, by itself, a SLI. It is a SLI of two GTX 680 in one PCB. So if you put two of them together, you get a 4-way SLI.
You probably missed it, but as I've edited in, the Extreme6 can handle 2-, 3-, and 4-way SLI.
There is one PCIe x1, two PCI, and two PCIe 3.0 slots. With the two PCIe 3.0 slots, you can do 2-way SLI or 4-way SLI. For example, the NVIDIA GTX 690 is, by itself, a SLI. It is a SLI of two GTX 680 in one PCB. So if you put two of them together, you get a 4-way SLI.
You probably missed it, but as I've edited in, the Extreme6 can handle 2-, 3-, and 4-way SLI.
Ah; thanks for the help. May grab an extreme6 instead, and upgrade to 2 or 3 GTX 660 ti's along the way.
Comparison of some of the Extreme motherboards: here. If you want to go 3-way SLI, you can get the Extreme 3 for much cheaper than the Extreme 6. Note, one slot will be at 2.0, but 3.0 with most cards only offers a 1-5% bonus in performance on average. Just Google search and you can find the information yourself